GENERATION OF ARBITRARY QUANTUM STATE VIA ATOMIC FEEDBACK

We present a scheme to realize the arbitrary control of the time evolution of an atom-cavity system via atomic feedback for the generation of an arbitrary quantum state. The scheme does not need to detect the atomic state, thus the uncontrollable measurement can be avoided.     

强场高次谐波时间特性的理论分析

通过用单电子近似求解含时薛定谔方程,用加窗傅里叶分析的方法,分析了单原子产生的高次谐波的时间特性。理论分析表明,基态粒子数消耗对不同级次谐波辐射的影响程度不一样;谐波辐射随着入射激光场强度的增加会出现饱和;随着谐波级次的增加,波辐射越来越趋向于集中在更短的时间间隔内,相应的线宽胡着谐波级次的增加而增加。     

光纤共焦扫描显微术用于光盘盘基预刻槽结构的检测

基于共焦扫描差分术,提出了检测不同表面反射率的物体表面表貌的方法,并提出了在光纤共焦扫描成像术中利用边缘判据进行边缘定位的极限尺度。上述思想用于检测光盘盘基预刻槽形结构,在建立的一套光纤共焦扫描成像装置上进行了光盘盘基预刻槽结构的检测,获得了槽宽、槽间距及槽深等实验数据,与槽标准参数相符。     

共焦显微镜中变距圆光栅函数掩模的研究

针对带有光瞳掩模的超分辨系统,提出了一种基于极坐标的性能 价标准,同时根据衍射光学相关理论,提出了变距圆光栅函数掩模花样。模拟计算结果表明,在共焦系统中掩模可以改变系统的点振幅响应,从而提高分辨率,并增强图像的反衬度。     

MEASUREMENT OF IONIC ENERGY FROM FEMTOSECOND LASER-HEATED ARGON CLUSTERS

The high backing pressure argon gases adiabatically expand into vacuum through a pulsed gas jet to nucleate into large clusters. The clusters were heated by a 45fs, 2.3×10¹⁶ Wcm^-2 Ti: sapphire laser. The high energy of the ions produced in the cluster explosion was measured using time-of-flight spectrometry. The maximum and average kinetic energy of the ions were 0.2MeV and ～12.5keV, respectively, indicating that the femtosecond laser interactions with argon clusters are more energetic than interactions with atoms and molecules.     

部分相干X射线相位成像研究

研究了基于同轴伽柏（Ｇａｂｏｒ）Ｘ射线全息方法的Ｘ射线相位成像。应用部分相干光的轴ＧａｂｏｒＸ射线全息理论,分析了射光的部分相干性对直接Ｘ射线相位成像的影响,指出相干性直接成像的影响不是很大,并研究了Ｘ射线相位全息。讨论了入射光的部分相干性、记录介质的有限分辨、物体与记录介质的准直程度和腹复原的位置等因素对成像质量的影响。证明了物体与记录介质的不准直是影响相位成像质量的最重要因素,给出了纵向记录长     

超快X射线衍射

本简单介绍了X射线静态衍射的基本原理,详细了论述了超快X射线衍射探测原子动态过程的理论基础。同时介绍了三种X射线脉冲光源的产生及其实验研究的进展状况,最后对实验结果进行了详细的理论分析。     

新型吡咯甲川-BF2化合物的光谱和激光性能研究

合成了6个最大吸收波长位于517nm-524nm的新型吡咯甲川－BF2化合物,测量了它们在无水乙醇溶液中的电子吸收光谱,测试结果表明,6个化合物的激光性能全部优于若丹明6G。     

碳、氮原子内壳层光电离X射线激光的理论探讨

提出了分析碳、氮原子内壳层光电离X射线激光的解析模型,对C原子K壳层光电离X射线激光的增益进行了理论计算。采用随时间线性增加的X射线抽运速率推导出了激光增益系数随抽运速率的上升速率、原子浓度以衣时间变化的解析表达式,给出了峰值时间和峰值增益。在理论上定量地分析了产生X射线激光所需的激光条件和最佳参数的选取,数值模拟与理论计算的结果是一致的。另外,对N原子K壳层光电离X射线激光作了类似的分析。     

High-intensity femtosecond laser absorption by rare-gas clusters

The energy absorption efficiency of high-intensity (～10^{16}W/cm^2) femtosecond laser pulses in a dense jet of large rare-gas clusters has been measured. Experimental results show that the energy absorption efficiency is strongly dependent on the cluster size and can be higher than 90%. The measurement of the ion energy indicates that the average ion energies of argon and xenon can be as high as 90 and 100keV, respectively. The dependence of the average energy of the ions on the cluster size is also measured. At comparatively low gas backing pressure, the average ion energies of argon and xenon increase with increasing gas backing pressure. The average ion energy of argon becomes saturated gradually with further increase of the gas backing pressure. For xenon, the average ion energy drops a little after the gas backing pressure exceeds 9 bar (3.2×10^5 atoms/cluster). The result showing the existence of a maximum average ion energy has been interpreted within the framework of the microplasma sphere model.